Abstract
Extracts prepared from late exponential phase Bacillus licheniformis cells contain an aspartokinase (ATP: l-aspartate 4-phosphotransferase, EC 2.7.2.4) activity that is 4-fold greater than that from early exponential phase cells. This increase occurs in cells grown on several different media. After growth has ceased, the specific activity decreases at a rate much greater than would be expected by turnover. The enzyme activity is subject to feedback inhibition by l-lysine and l-aspartic-β-semialdehyde. l-Threonine has no effect on the activity when added alone but produces a concerted inhibition with l-lysine. The asparticβ-semialdehyde effect may be an example of sequetial control.
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